The Median Annual growth in the S&P 500 Index from 1970 to 2014 is 12.64%. As long as goods are bought and sold and global economic growth continues, the S&P 500 will follow. Yung Finance's Chart on why you shouldn't be worried about another recession (In Comments Section) helps to illustrate this concept. Aside from fundamentals, Cloned 1980-2000 price action helps give a general idea of what to expect in the distant future. The Fibonacci resistance channel has spectacular influence on price action and will most likely continue to do so. The next significant Fibonacci resistance level is around the 10,000 Point level which leave tremendous room for growth. I hope this TA as helpful and if it was please leave a like or a comment! Happy Trading (Or in this case long term investing)